[X86] Add Clang support for intrinsics __rdtsc and __rdtscp.

This patch:
 1. Adds a definition for two new GCCBuiltins in BuiltinsX86.def:
   __builtin_ia32_rdtsc;
   __builtin_ia32_rdtscp;

 2. Replaces the already existing definition of intrinsic __rdtsc in
    ia32intrin.h with a simple call to the new GCC builtin __builtin_ia32_rdtsc.

 3. Adds a definition for the new intrinsic __rdtscp in ia32intrin.h

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@207132 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/clang/Basic/BuiltinsX86.def b/include/clang/Basic/BuiltinsX86.def
index 4a67fc1f5ff4135e4b02a3bb3911977ab350c779..8faaea381aeb866ed0f92b8524fbb50697b798db 100644 (file)
--- a/include/clang/Basic/BuiltinsX86.def
+++ b/include/clang/Basic/BuiltinsX86.def
@@ -760,5 +760,7 @@ BUILTIN(__builtin_ia32_xbegin, "i", "")
 BUILTIN(__builtin_ia32_xend, "v", "")
 BUILTIN(__builtin_ia32_xabort, "vIc", "")
 BUILTIN(__builtin_ia32_xtest, "i", "")
+BUILTIN(__builtin_ia32_rdtsc, "ULLi", "")
+BUILTIN(__builtin_ia32_rdtscp, "ULLiUi*", "")
 
 #undef BUILTIN

diff --git a/lib/Headers/ia32intrin.h b/lib/Headers/ia32intrin.h
index a5985f660bbb43244e3f7b0216531d379dcd7429..55c22473ba775a34fbcb12257e1c44b9eb2eb432 100644 (file)
--- a/lib/Headers/ia32intrin.h
+++ b/lib/Headers/ia32intrin.h
@@ -82,9 +82,13 @@ __writeeflags(unsigned int __f)
 /* __rdtsc */
 static __inline__ unsigned long long __attribute__((__always_inline__, __nodebug__))
 __rdtsc(void) {
-  unsigned int __eax, __edx;
-  __asm__ ("rdtsc" : "=a" (__eax), "=d" (__edx));
-  return ((unsigned long long)__edx << 32) | __eax;
+  return __builtin_ia32_rdtsc();
+}
+
+/* __rdtscp */
+static __inline__ unsigned long long __attribute__((__always_inline__, __nodebug__))
+__rdtscp(unsigned int *__A) {
+  return __builtin_ia32_rdtscp(__A);
 }
 
 #define _rdtsc() __rdtsc()

diff --git a/test/CodeGen/builtins-x86.c b/test/CodeGen/builtins-x86.c
index 261bf2f5d8b32adfca7e6c922c55523cba6bfafb..6df005d86048fe28fe87f72e5b2c3547b896124a 100644 (file)
--- a/test/CodeGen/builtins-x86.c
+++ b/test/CodeGen/builtins-x86.c
@@ -263,6 +263,9 @@ void f0() {
   tmp_V4f = __builtin_ia32_cvtpi2ps(tmp_V4f, tmp_V2i);
   tmp_V2i = __builtin_ia32_cvtps2pi(tmp_V4f);
   tmp_i = __builtin_ia32_cvtss2si(tmp_V4f);
+
+  tmp_i = __builtin_ia32_rdtsc();
+  tmp_i = __builtin_ia32_rdtscp(&tmp_Ui);
 #ifdef USE_64
   tmp_LLi = __builtin_ia32_cvtss2si64(tmp_V4f);
 #endif